What is FTP and what is it for?

What is FTP and what is it for?

If you have ever needed to put a website online or send large files to a server, you have probably come across the acronym FTP. It is one of the oldest terms in web hosting and, at the same time, one of the most practical for people who manage their own sites. In this article we explain what FTP is, what it is used for, how it works, which programs you need, and how it differs from safer options such as SFTP and FTPS.

What is FTP?

FTP stands for File Transfer Protocol. It is a network protocol designed in the 1970s that allows files to be sent and received between two computers connected to a network, usually between your local computer and a remote server.

It works like a bridge between two parties: the FTP server, which stores the files and waits for incoming connections, and the FTP client, which starts the conversation to upload, download, or manage files. The protocol defines the exact rules of that conversation, so both sides understand each other even when they run different operating systems or programs.

The fact that FTP is one of the oldest internet protocols does not mean it is obsolete. Many hosting services still offer it, and understanding its logic makes managing any website easier, even if you now prefer more modern tools.

What is FTP used for?

The most common use of FTP is publishing a website. When you build a site on your computer, the files stay on your local disk; for visitors to see it, those files must be copied to the server where your hosting account lives, and FTP is one of the classic ways to do that.

• Uploading site files to the hosting: HTML pages, images, style sheets, documents, and any other resource that makes up the site are transferred from your local computer to the server.
• Updating content: when you edit a page or replace an image, you can upload only the changed files instead of the whole site.
• Downloading backups: it also lets you bring a copy of the server files to your computer to keep a local backup.
• Moving large files: for heavy documents that email services will not accept, an FTP or SFTP connection is a practical alternative.
• Managing the server: creating folders, renaming files, or checking permissions are routine tasks inside an FTP client.

In short, FTP is the traditional way to move the content of your computer to the server and back, and it remains useful in daily work with web hosting.

How does FTP work?

For an FTP transfer to happen, two components are needed: an active FTP server and an FTP client program on the computer of the person connecting. The server listens for requests on a specific port, usually port 21, and the client starts the session pointing at that port.

The connection requires authentication. The user enters a username and a password assigned by the hosting provider; when the credentials are correct, the client gains access to the site's folder and the transfer begins. Some public servers allow so-called anonymous access, but on a real hosting account you almost always need your own credentials.

A particular feature of FTP is that it uses two communication channels: one to send commands and another to transfer the data. In practice you do not need to know that detail to use it, but it explains why sometimes the connection works while the transfer does not advance, especially when a firewall is involved.

Which programs are used as FTP clients?

An FTP client is the program you install on your computer or phone to connect to the server. There are many free and open-source options; one of the best known is FileZilla, available for Windows, macOS, and Linux, and widely used by beginners and professionals alike.

Besides dedicated clients, some code editors and file managers include built-in FTP support, which avoids installing extra programs. There are also online FTP clients that run directly in the browser; they are convenient for occasional tasks, although for large transfers a desktop client is preferable, since it tends to be more stable and can resume interrupted downloads.

Whichever program you choose, the logic is the same: one panel shows your local files and the other shows the server files, and transfers are done by dragging items from one side to the other.

FTP vs SFTP vs FTPS: what is the difference?

The weak point of classic FTP is security: it sends data, including the password, without encryption. Anyone with access to the network could intercept the information. That is why two variants were created: FTPS, which adds SSL/TLS encryption to FTP, and SFTP, which is not exactly FTP but a file transfer service that travels over the SSH protocol.

For connections over the internet, the general recommendation is to use SFTP whenever the server allows it: it encrypts both the data and the credentials, and relies on the same secure authentication system as SSH. FTPS is a valid alternative when the hosting only offers FTP, since it adds encryption to the traditional protocol. Plain FTP should be reserved for local networks where the risk of interception is low.

How to connect to an FTP server step by step

To establish a connection you need four pieces of information, which the hosting provider usually emails to you or shows in the control panel:

• Server or host: the address of the server, such as ftp.yourdomain.com, or an IP address.
• Username: the FTP account created in the hosting.
• Password: the key associated with that account.
• Port: 21 for FTP or explicit FTPS, and 22 for SFTP.

With that information at hand, the steps are the following:

1. Open your FTP client, such as FileZilla, and go to the site manager or the quick connect field.
2. Enter the connection details: server, username, password, and port according to the chosen protocol.
3. Connect by pressing the connect button; if the details are correct, you will see the remote directory of the server.
4. Find the right folder; on shared hosting it is usually called public_html or htdocs, and it is the public root of the site.
5. Transfer the files by dragging them from the local panel to the remote panel, or the other way around to download them.
6. Verify the upload by checking that the files appear on the server and that your site loads correctly.
7. Log out when you finish, to free up the allowed connections of your account.

A modern alternative: the hosting file manager

Nowadays installing an FTP client is not essential. Most hosting control panels, such as cPanel, Plesk, or the proprietary panels of each provider, include a file manager that works from the browser.

With that tool you can upload files with a click, create and delete folders, edit text files, compress and decompress packages, and change permissions, all without installing anything. It is the recommended option for people who manage a site occasionally, while FTP or SFTP remain more efficient for uploading many files or entire folders from a computer.

Many hosts also let you publish through other modern routes, such as the integrated file manager or automatic deployment systems. The key is to choose the tool that best fits your technical level and how often you update your site.

In short, FTP is a reliable protocol for transferring files between your computer and a server, and knowing it lets you publish and maintain a website on your own. For internet connections, always choose an encrypted variant such as SFTP or FTPS, and when the task is occasional, your hosting's file manager may be the simplest option.